“Air gap” means a physical separation sufficient to prevent backflow between the free-flowing discharge end of the potable water system and any other system. Physically defined as a distance equal to twice the diameter of the supply-side pipe diameter but never less than one inch.

“Approved” means accepted by the inspector as meeting an applicable specification stated or cited in this regulation, or as suitable for the proposed use.

“Atmosphere vacuum breaker” means a device which prevents back siphonage by creating an atmospheric vent when there is either a negative pressure or subatmospheric pressure on a water system.

“Auxiliary water supply” means any water supply, on or available to the premises, other than the supplier’s approved public potable water supply.

“Back pressure” means a condition in which the owner’s system pressure is greater than the supplier’s system pressure.

“Back siphonage” means the flow of water or other liquids, mixtures or substances into the distribution pipes of a potable water supply system from any source other than its intended source caused by the sudden reduction of the pressure in the potable water supply system.

“Backflow” means the flow of water or other liquids, mixtures or substances under positive or reduced pressure in the distribution pipes of a potable water supply from any source other than its intended source.

“Backflow preventer” means a device or means designed to prevent backflow or back siphonage. Most commonly categorized as air gap, reduced pressure principle device, double check valve assembly, pressure vacuum breaker, atmospheric vacuum breaker, hose bibb vacuum breaker, and double check with intermediate atmospheric vent. Any device must be classified as an approved backflow device by the Oregon Health Division.

“Containment” means a method of backflow prevention which requires a backflow preventer at the water service entrance.

“Contaminant” means any substance that will impair the quality of the water to a degree that it creates a serious health hazard to the public leading to poisoning or the spread of disease.

“Cross-connection” means any actual or potential connection between the public water supply and a source of contamination or pollution.

“Division” means the State of Oregon Public Health Division.

“Double check valve assembly” means an assembly of two independently operating spring- loaded check valves with tightly closing shut-off valves on each side of the check valve, plus properly located test cocks for the testing of each check valve.

“Double check valve with intermediate atmospheric vent” means a device having two spring- loaded check valves separated by an atmospheric vent chamber.

“Fixture isolation” means a method of backflow prevention in which a backflow preventer is located to correct a cross-connection at an in-plant location rather than at a water service entrance.

“Hose bibb vacuum breaker” means a device which is permanently attached to a hose bibb and which acts as an atmospheric vacuum breaker.

“Owner” means any person who has legal title to, or license to operate or habitat in, a property upon which a cross-connection inspection is to be made or upon which a cross-connection is present.

“Permit” means a document issued by the utility which allows the use of a backflow preventer.

“Person” means any individual, partnership, company, public or private corporation, political subdivision or agency of the State Division, agency or instrumentality of the United States or any other legal entity.

“Pollutant” means a foreign substance that, if permitted to get into the public water system, will degrade its quality so as to constitute a moderate hazard, or impair the usefulness or quality of the water to a degree which does not create an actual hazard to the public health but which does adversely and unreasonably affect such water for domestic use.

“Pressure vacuum breaker” means a device containing one or two independently operating approved check valves and an independently operated spring-loaded air inlet valve located on the discharge side of the check or checks. Device includes tightly closing shut-off valves on each side of the check valves and properly located test cocks for the testing of the check valve(s).

“Public works” means the director, or his delegate representative in charge of the city of Yoncalla water department, is invested with the authority and responsibility for the implementation of a cross-connection control program and for the enforcement of the provisions of this chapter.

“Reduced pressure principle backflow preventer” means an assembly consisting of two independently operating approved check valves with an automatically operating differential relief valve located between the two check valves, tightly closing shut-off valves on each side of the check valves plus properly located test cocks for the testing of the check valves and the relief valves.

“Utility” means the city of Yoncalla water department.

“Water service entrance” means that point in the owner’s water system beyond the sanitary control of the district; generally considered to the outlet end of the water meter and always before any unprotected branch. (Ord. 347 § 4, 1995).